Examples with ByteOrder java.nio.ByteOrder used on opensource projects

Example 16 with ByteOrder

use of java.nio.ByteOrder in project weiui by kuaifan.

the class ImageHeaderParser method parseExifSegment.

private static int parseExifSegment(RandomAccessReader segmentData) {
    final int headerOffsetSize = JPEG_EXIF_SEGMENT_PREAMBLE.length();
    short byteOrderIdentifier = segmentData.getInt16(headerOffsetSize);
    final ByteOrder byteOrder;
    if (byteOrderIdentifier == MOTOROLA_TIFF_MAGIC_NUMBER) {
        byteOrder = ByteOrder.BIG_ENDIAN;
    } else if (byteOrderIdentifier == INTEL_TIFF_MAGIC_NUMBER) {
        byteOrder = ByteOrder.LITTLE_ENDIAN;
    } else {
        if (Log.isLoggable(TAG, Log.DEBUG)) {
            Log.d(TAG, "Unknown endianness = " + byteOrderIdentifier);
        }
        byteOrder = ByteOrder.BIG_ENDIAN;
    }
    segmentData.order(byteOrder);
    int firstIfdOffset = segmentData.getInt32(headerOffsetSize + 4) + headerOffsetSize;
    int tagCount = segmentData.getInt16(firstIfdOffset);
    int tagOffset, tagType, formatCode, componentCount;
    for (int i = 0; i < tagCount; i++) {
        tagOffset = calcTagOffset(firstIfdOffset, i);
        tagType = segmentData.getInt16(tagOffset);
        // We only want orientation.
        if (tagType != ORIENTATION_TAG_TYPE) {
            continue;
        }
        formatCode = segmentData.getInt16(tagOffset + 2);
        // 12 is max format code.
        if (formatCode < 1 || formatCode > 12) {
            if (Log.isLoggable(TAG, Log.DEBUG)) {
                Log.d(TAG, "Got invalid format code = " + formatCode);
            }
            continue;
        }
        componentCount = segmentData.getInt32(tagOffset + 4);
        if (componentCount < 0) {
            if (Log.isLoggable(TAG, Log.DEBUG)) {
                Log.d(TAG, "Negative tiff component count");
            }
            continue;
        }
        if (Log.isLoggable(TAG, Log.DEBUG)) {
            Log.d(TAG, "Got tagIndex=" + i + " tagType=" + tagType + " formatCode=" + formatCode + " componentCount=" + componentCount);
        }
        final int byteCount = componentCount + BYTES_PER_FORMAT[formatCode];
        if (byteCount > 4) {
            if (Log.isLoggable(TAG, Log.DEBUG)) {
                Log.d(TAG, "Got byte count > 4, not orientation, continuing, formatCode=" + formatCode);
            }
            continue;
        }
        final int tagValueOffset = tagOffset + 8;
        if (tagValueOffset < 0 || tagValueOffset > segmentData.length()) {
            if (Log.isLoggable(TAG, Log.DEBUG)) {
                Log.d(TAG, "Illegal tagValueOffset=" + tagValueOffset + " tagType=" + tagType);
            }
            continue;
        }
        if (byteCount < 0 || tagValueOffset + byteCount > segmentData.length()) {
            if (Log.isLoggable(TAG, Log.DEBUG)) {
                Log.d(TAG, "Illegal number of bytes for TI tag data tagType=" + tagType);
            }
            continue;
        }
        // assume componentCount == 1 && fmtCode == 3
        return segmentData.getInt16(tagValueOffset);
    }
    return -1;
}

Example 17 with ByteOrder

use of java.nio.ByteOrder in project Rocket by mozilla-tw.

the class DefaultImageHeaderParser method parseExifSegment.

private static int parseExifSegment(RandomAccessReader segmentData) {
    final int headerOffsetSize = JPEG_EXIF_SEGMENT_PREAMBLE.length();
    short byteOrderIdentifier = segmentData.getInt16(headerOffsetSize);
    final ByteOrder byteOrder;
    if (byteOrderIdentifier == MOTOROLA_TIFF_MAGIC_NUMBER) {
        byteOrder = ByteOrder.BIG_ENDIAN;
    } else if (byteOrderIdentifier == INTEL_TIFF_MAGIC_NUMBER) {
        byteOrder = ByteOrder.LITTLE_ENDIAN;
    } else {
        if (Log.isLoggable(TAG, Log.DEBUG)) {
            Log.d(TAG, "Unknown endianness = " + byteOrderIdentifier);
        }
        byteOrder = ByteOrder.BIG_ENDIAN;
    }
    segmentData.order(byteOrder);
    int firstIfdOffset = segmentData.getInt32(headerOffsetSize + 4) + headerOffsetSize;
    int tagCount = segmentData.getInt16(firstIfdOffset);
    int tagOffset, tagType, formatCode, componentCount;
    for (int i = 0; i < tagCount; i++) {
        tagOffset = calcTagOffset(firstIfdOffset, i);
        tagType = segmentData.getInt16(tagOffset);
        // We only want orientation.
        if (tagType != ORIENTATION_TAG_TYPE) {
            continue;
        }
        formatCode = segmentData.getInt16(tagOffset + 2);
        // 12 is max format code.
        if (formatCode < 1 || formatCode > 12) {
            if (Log.isLoggable(TAG, Log.DEBUG)) {
                Log.d(TAG, "Got invalid format code = " + formatCode);
            }
            continue;
        }
        componentCount = segmentData.getInt32(tagOffset + 4);
        if (componentCount < 0) {
            if (Log.isLoggable(TAG, Log.DEBUG)) {
                Log.d(TAG, "Negative tiff component count");
            }
            continue;
        }
        if (Log.isLoggable(TAG, Log.DEBUG)) {
            Log.d(TAG, "Got tagIndex=" + i + " tagType=" + tagType + " formatCode=" + formatCode + " componentCount=" + componentCount);
        }
        final int byteCount = componentCount + BYTES_PER_FORMAT[formatCode];
        if (byteCount > 4) {
            if (Log.isLoggable(TAG, Log.DEBUG)) {
                Log.d(TAG, "Got byte count > 4, not orientation, continuing, formatCode=" + formatCode);
            }
            continue;
        }
        final int tagValueOffset = tagOffset + 8;
        if (tagValueOffset < 0 || tagValueOffset > segmentData.length()) {
            if (Log.isLoggable(TAG, Log.DEBUG)) {
                Log.d(TAG, "Illegal tagValueOffset=" + tagValueOffset + " tagType=" + tagType);
            }
            continue;
        }
        if (byteCount < 0 || tagValueOffset + byteCount > segmentData.length()) {
            if (Log.isLoggable(TAG, Log.DEBUG)) {
                Log.d(TAG, "Illegal number of bytes for TI tag data tagType=" + tagType);
            }
            continue;
        }
        // assume componentCount == 1 && fmtCode == 3
        return segmentData.getInt16(tagValueOffset);
    }
    return -1;
}

Example 18 with ByteOrder

use of java.nio.ByteOrder in project jeesuite-libs by vakinge.

the class ConsistencyHash method hash.

private static Long hash(String key) {
    if (key == null)
        return 0L;
    ByteBuffer buf = ByteBuffer.wrap(key.getBytes());
    int seed = 0x1234ABCD;
    ByteOrder byteOrder = buf.order();
    buf.order(ByteOrder.LITTLE_ENDIAN);
    long m = 0xc6a4a7935bd1e995L;
    int r = 47;
    long h = seed ^ (buf.remaining() * m);
    long k;
    while (buf.remaining() >= 8) {
        k = buf.getLong();
        k *= m;
        k ^= k >>> r;
        k *= m;
        h ^= k;
        h *= m;
    }
    if (buf.remaining() > 0) {
        ByteBuffer finish = ByteBuffer.allocate(8).order(ByteOrder.LITTLE_ENDIAN);
        finish.put(buf).rewind();
        h ^= finish.getLong();
        h *= m;
    }
    h ^= h >>> r;
    h *= m;
    h ^= h >>> r;
    buf.order(byteOrder);
    return Math.abs(h);
}

Example 19 with ByteOrder

use of java.nio.ByteOrder in project Mycat_plus by coderczp.

the class Shard method hash.

/**
 * MurMurHash算法，是非加密HASH算法，性能很高，
 * 比传统的CRC32,MD5，SHA-1（这两个算法都是加密HASH算法，复杂度本身就很高，带来的性能上的损害也不可避免）
 * 等HASH算法要快很多，而且据说这个算法的碰撞率很低.
 * http://murmurhash.googlepages.com/
 */
private Long hash(String key) {
    ByteBuffer buf = ByteBuffer.wrap(key.getBytes());
    int seed = 0x1234ABCD;
    ByteOrder byteOrder = buf.order();
    buf.order(ByteOrder.LITTLE_ENDIAN);
    long m = 0xc6a4a7935bd1e995L;
    int r = 47;
    long h = seed ^ (buf.remaining() * m);
    long k;
    while (buf.remaining() >= 8) {
        k = buf.getLong();
        k *= m;
        k ^= k >>> r;
        k *= m;
        h ^= k;
        h *= m;
    }
    if (buf.remaining() > 0) {
        ByteBuffer finish = ByteBuffer.allocate(8).order(ByteOrder.LITTLE_ENDIAN);
        // for big-endian version, do this first:
        // finish.position(8-buf.remaining());
        finish.put(buf).rewind();
        h ^= finish.getLong();
        h *= m;
    }
    h ^= h >>> r;
    h *= m;
    h ^= h >>> r;
    buf.order(byteOrder);
    return h;
}

Example 20 with ByteOrder

use of java.nio.ByteOrder in project sis by apache.

the class ImageInputStreamComparator method getByteOrder.

/**
 * Forwards the call to the two streams and ensures that they return identical results.
 *
 * @return the result of the forwarded call.
 */
@Override
public ByteOrder getByteOrder() {
    final ByteOrder r = expected.getByteOrder();
    assertEquals(r, actual.getByteOrder());
    return r;
}